Central Bureau for Astronomical Telegrams
IAUC 3415: ESO 012-G21; Ori A; NOTICE RE Tlgms
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Circular No. 3415
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
ESO 012-G21
R. M. West, European Southern Observatory, commnunicates: "The
galaxy ESO 012-G21 (R.A. = 0h39m16s, Decl. = -79o30'.9, equinox 1950.0) was
found on the ESO (B) Atlas and described in ESO-Uppsala List No. 6
(Holmberg et al. 1978, A. & Ap. Suppl. 34, 285). Under good seeing
it shows a bright starlike nucleus smaller than 1" surrounded by a
diffuse, elliptical halo. A spectrum (Las Campanas 2.5-m reflector,
reticon spectrograph) shows typical Seyfert 1 emission lines. H-alpha
and H-beta are very broad (> 10 nm). The O III lines are very strong,
but narrower. Several Fe II lines are present. The redshift z =
0.03. Standard UBV photometry by C. Sterken (Bochum 0.6-m reflector)
gave a mean value over three nights of V = 14.5; a variation
is not excluded. A deep electrograph in B obtained by P. Grosboel
(Danish 1.5-m reflector, 40-mm McMullan camera) shows two diagonally
opposite, faint diffuse spiral features, extending 15" on either
side of the nucleus. With a Hubble constant of 50 km s**-1 Mpc**-1, Mv
= -22 and the size is 25 kpc. It is noted that the position is
within 0o.7 of the x-ray source 3U 0055-79 (Giacconi et al. 1974,
Ap. J. Suppl. 27, 37). The area was confused in the Ariel 5 survey
(Cooke et al. 1978, M.N. 182, 489), and the source is not present
in the 4U catalogue (Forman et al. 1978, Ap. J. Suppl. 38, 357).
ESO 012-G21 is the most conspicuous extragalactic object around."
ORION A
Z. Abraham, R. Opher and J. C. Raffaelli, CRAAM-Observatorio
Nacional, Rio de Janeiro, report a giant outburst in Ori A observed
with the Itapetinga radio telescope in the 22-GHz water line at a
velocity of ~ 8 km/s with respect to the local standard of rest.
On Oct. 15 the measured intensity was ~ 2 x 10**6 Jy with a line
width of ~ 0.3 km/s; the line was highly linearly polarized.
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1979 October 25 (3415) Brian G. Marsden
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